hwmon: (lm90) Restore configuration on exit
Restore the chip configuration when unloading the driver. This ensures
we don't leave the chip running if it was initially stopped.
Signed-off-by: Jean Delvare <khali@linux-fr.org>
diff --git a/drivers/hwmon/lm90.c b/drivers/hwmon/lm90.c
index ddf617f..4cbbf15 100644
--- a/drivers/hwmon/lm90.c
+++ b/drivers/hwmon/lm90.c
@@ -1,7 +1,7 @@
/*
* lm90.c - Part of lm_sensors, Linux kernel modules for hardware
* monitoring
- * Copyright (C) 2003-2009 Jean Delvare <khali@linux-fr.org>
+ * Copyright (C) 2003-2010 Jean Delvare <khali@linux-fr.org>
*
* Based on the lm83 driver. The LM90 is a sensor chip made by National
* Semiconductor. It reports up to two temperatures (its own plus up to
@@ -203,6 +203,8 @@
int kind;
int flags;
+ u8 config_orig; /* Original configuration register value */
+
/* registers values */
s8 temp8[4]; /* 0: local low limit
1: local high limit
@@ -840,7 +842,7 @@
static void lm90_init_client(struct i2c_client *client)
{
- u8 config, config_orig;
+ u8 config;
struct lm90_data *data = i2c_get_clientdata(client);
/*
@@ -852,7 +854,7 @@
dev_warn(&client->dev, "Initialization failed!\n");
return;
}
- config_orig = config;
+ data->config_orig = config;
/* Check Temperature Range Select */
if (data->kind == adt7461) {
@@ -870,7 +872,7 @@
}
config &= 0xBF; /* run */
- if (config != config_orig) /* Only write if changed */
+ if (config != data->config_orig) /* Only write if changed */
i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1, config);
}
@@ -885,6 +887,10 @@
device_remove_file(&client->dev,
&sensor_dev_attr_temp2_offset.dev_attr);
+ /* Restore initial configuration */
+ i2c_smbus_write_byte_data(client, LM90_REG_W_CONFIG1,
+ data->config_orig);
+
kfree(data);
return 0;
}